Corner step stool



FIG. 1 is a front and right perspective view of the corner step stool showing my new design;

FIG. 2 is a back and left perspective view of the corner step stool;

FIG. 3 is a top view of the corner step stool;

FIG. 4 is a bottom view of the corner step stool;

FIG. 5 is a front view of the corner step stool;

FIG. 6 is a back view of the corner step stool;

FIG. 7 is a left side view of the corner step stool; and,

FIG. 8 is a right side view of the corner step stool. 

CLAIM The ornamental design for a corner step stool. 